Electric plug



April 1931- R. N IAYRSHOFER 1,800,259

ELECTRIC PLUG Filed April 10. 1929 NVENTOR= lab/24rd Mayra/a er TORNE'YS Patented Apr. 14, 1931 UNITED STATES BIGHABD MAYBSEOFEB. OF MUNICH,GEBKANY ELECTRIC PLIIG Application filed April '10, 1929,

This invention relates to electric plugs of the kind furnished with aswitchin means for connecting or disconnecting t e current.

15 In plugs of this descri been proposed to furnis the same with a.switching means capable of being operated from the exterior. It ispossible, however, to construct these known arrangements only in theiorm of single-pole switches, whereas in many cases a double-pole systemis to be desired.

It is the primaryob'ect of the present invention to overcome t edrawback in question, an additional object bein to provide a plug whichis entirely closed 0 against the exter1or,th11s avoiding any slots oropen portions for the movement of an exteriorly o erated lever or thelike for actuating the switch mechanism, which slots or openings, aswill be readily obvious, allow the enetration of dust, etc., into theinterior of t e plug. With these objects in view and such others as willbe apparent as the description proceeds, I accordingly make the plug oftwo parts, and carry the contact portions moved into and out ofengagement with each other.

These two parts consist of a sleeve or female rtion, which is closed ofiat the one end,

and a socket or male portion adapted to be rotated in the said sleeve.The two parts are connected in such manner that merely rotation ispossible without axial displacement.

The bottom or end furnished with the p u pins, which are connected onthe inner si e of the bottom with metallic rests. On the inner side ofthe bottom, projecting into the interior of the sleeve, are a so provied contact s rings, which are connected with the leads. e two parts of'theplug, male and female portion, are made ofa suitable insulatingmaterial. In addi tion to the metallic rests there are also pro- 15.vided in the bottom of the sleeve recesses into which the contactsprings move when the current is cut ofi.

The invention will now be described more fully with reference to theaccompan ing 50 drawing, in which the invention is i ustion it hasalready which are capable of relative rotation ortion of the sleeve isSerial Ho. 353,974,;1111 in Germany April :1, 1m.

trated by way of example in one possible form of embodiment.

Fi 1 shows the plug with the male and fema e portions taken apart.

Fig. 2 is a section along the line IIII in Fig. 1. 4 ig. 3 shows theplug in assembled form, i. e., with the male and female ortions settogether, and rotated at an ang e 'of 90 in relation to Fig.1.

,Referring now to the drawing, the plug casin consists of the sleeve orfemale portion 1. 1, an the, socket or male portion 3, which isfurnished with an edge flange 2. At the center of the sleeve bottomthere is provided an elevated portion 4, which is engaged by a tubularprojection 5 on the socket 3 when the plu is assembled, the tubularprojection exten ing into a cavity in the said 'elevation. As shown inFig. 3, the parts are held together by means of a screw or the like 6and, although the same may be relatively rotated, they are incapable'ofaxial displacement.

In the bottom or end portion of the sleeve 1 there are secured the plugpins 7, which are electrically connected with metallic rests on theinner side of the said bottom. In the latter are also providedadditional rests 9 consisting of recesses in the insulating material.Contact springs 10 bent to a suitable shape are mounted on the face sideof the socket or male portion 3, these springs being connected to theleads 11.

The operation of the plug is as follows: The plu is fitted with its pins7 into a wall socket o the usual kind. Indication of the relativeposition of the male portion 3 to the female portion 1, that is tosay-the relative positions of the contact springs 10 and the rests 8,may be given by the provision of suitable exterlor markings. It isassumed that the springs 10 rest above or in the rests 9, i. e., therecesses in the insulating) material. In this position the current isuna le to pass through the pins 7 into the leads. If, however, themember 3 is rotated to the extent of 90 in relation to the sleeve 1, thesprings 10 are moved a ainst the rests 8, and the current is able toiibw throu h the pins 7 and the leads 11 to the point 0 consumption. By

. simply rotating again cut oil.

The rests 8 and 9 may be constructed in such manner that in the onedirection of rotation the springs encounter so much resistance as tocause a locking of the device, so that rotation is possible inonedirection only. It

Y is made to the specific form of embodiment is possible, however, toalso make the mats insuch manner as to allow rotation of the member 3 inrelation to the sleeve 1- in both directions. 1

It will be understood that no restriction shown, and t that variousmodifications may be made without departing from the spirit of theinvention by Letters Patent is tubular member having a :What I claim asnew and desire-to 1. An electricalswitch plug, comprising a tubularmember having a bottom wall 'at one end thereof, a closing memberrotatable in the opposite end of said tubular member and having acentral bearing on said bottom Wall,- means for, securing said tubularmem her and end-closingmemberj together for relative rotation andagainst relative axial movement, .fixed contactformin members securedon' said bottom wall, and exible contact-forming members carried by saidendclosing member and adapted to be rotated into and out oi contact withsaid fixed members.

2. An electrical switchend thereofia' closingmember rotatablein theopposite and of said: tubular member and having a central'bea'ring onsaid bottom wall,

receive saidflexible contact members and re- 'said means forsecurinfieiaid'tubular member and end-closing meni together for relativerotation and agamt relative axial movement, I

fixed contact-forming members secured on said bottom wall,and-fleudblecont ict forming. member and adapted to bet-outed into andouter com members camied'by said and-closing m i h said fixed memberg &having pre sions melon adapted to members. A I 3. electrical, plug, ion; rising a tubular member having also end thereof, a closing memberrotatahis in the opposite end of said tubular memberysa d bottomwall-aad'end-closing member having w a central a? m the other anintegral cylindrigalprojection' sew edin aiaidcu gmeas dpoesm g 'f rin ufan a o 1 tion- 'or am 1g said-tubula lue ibar a n d di l d-dosingmember together for relative rotation and fle'glible contletdorminginemheia by said end-closing member Ind-adopted to be lug, comprising attom wall-at one ttom wa at one members.

In testimony signature.

axmllythrougli against relative axial movement, fixed'eontaetaformsingmambere aecnndon said bottomwelLand whereof I have aflixed my RIGHARDMAYRSHOFER.

the socket the current isrotated into and out of contact with said fixed

